<?php 
namespace api;

class UserService{
 public static $instance = null;
 
    private function __construct(){
    }
    public static function getInstance(){
        if(self::$instance == null){
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    public function getUserName(){
    	return "hello world";
    }
}
?>